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Gradient SERS substrates with multiple resonances for analyte screening: fabrication and SERS applications

  • Surface-enhanced Raman spectroscopy (SERS) provides a strong enhancement to an inherently weak Raman signal, which strongly depends on the material, design, and fabrication of the substrate. Here, we present a facile method of fabricating a non-uniform SERS substrate based on an annealed thin gold (Au) film that offers multiple resonances and gap sizes within the same sample. It is not only chemically stable, but also shows reproducible trends in terms of geometry and plasmonic response. Scanning electron microscopy (SEM) reveals particle-like and island-like morphology with different gap sizes at different lateral positions of the substrate. Extinction spectra show that the plasmonic resonance of the nanoparticles/metal islands can be continuously tuned across the substrate. We observed that for the analytes 1,2-bis(4-pyridyl) ethylene (BPE) and methylene blue (MB), the maximum SERS enhancement is achieved at different lateral positions, and the shape of the extinction spectra allows for the correlation of SERS enhancement with surface morphology. Such non-uniform SERS substrates with multiple nanoparticle sizes, shapes, and interparticle distances can be used for fast screening of analytes due to the lateral variation of the resonances within the same sample.

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Metadaten
Author of HS ReutlingenMukherjee, Ashutosh; Wackenhut, Frank; Brecht, Marc
URN:urn:nbn:de:bsz:rt2-opus4-38881
DOI:https://doi.org/10.3390/molecules27165097
ISSN:1420-3049
Erschienen in:Molecules
Publisher:MDPI
Place of publication:Basel
Document Type:Journal article
Language:English
Publication year:2022
Tag:SERS substrates; island film; multiple plasmonic resonances; surface-enhanced Raman spectroscopy (SERS)
Volume:27
Issue:16
Page Number:13
Article Number:5097
DDC classes:540 Chemie
Open access?:Ja
Licence (German):License Logo  Creative Commons - CC BY - Namensnennung 4.0 International